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The payback period of a variable-speed drive on a fluid load depends chiefly on

  • A.how much of the time the load runs below full flow
  • B.the rated efficiency of the machine at full load
  • C.the number of poles for which the machine is wound
  • D.the insulation class of the machine being controlled

Answer: A

A load that runs at full flow all day saves nothing, while one that spends most of its time at seventy per cent saves a great deal. The duty profile is therefore the first thing to establish before any such investment is justified.

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